Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2003 Lexus LS 430FACTORY OEM SERVICE PROCEDURE
HVAC DTCS
HVAC DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC | Description |
|---|---|
| B1411/11 | Room temperature sensor circuit |
| B1412/12 | Ambient temperature sensor circuit |
| B1413/13 | Evaporator temperature sensor circuit |
| B1415/15 | Duct sensor circuit (Driver side) |
| B1416/16 | Duct sensor circuit (Passenger side) |
| B1418/18 | Exhaust gas sensor circuit (HC, CO) |
| B1421/21 | Solar sensor circuit (Passenger side) |
| B1422/22 | All conditions below are detected for 3 secs. or more
|
| B1423/23 | Open in pressure sensor circuit Abnormal refrigerant pressure [below 181 kPa (1.8 kgf/cm2 , 26 psi) over 3,110 kPa (31.1 kgf/cm2 , 451 psi)] |
| B1424/24 | Solar sensor circuit (Driver side) |
| B1428/28 | Solar sensor circuit (Rear side) |
| B1432/32 | Air inlet damper position sensor circuit |
| B1434/34 | Cool air bypass damper position sensor circuit (Driver side) |
| B1435/35 | Cool air bypass damper position sensor circuit (Passenger side) |
| B1442/42 | Air inlet damper control servomotor |
| B1451/51 | Solenoid of the externally changeable compressor circuit |
| B1461/61 | Exhaust gas sensor circuit (NOx) |
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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